Section 3. RSCS Data Areas and Control Blocks Tbis section describes in detail each of the data areas used by RSCS. Unlike the CP and C!S format tlocks in this publication, the RSCS format tlocks are on fullword boundaries.
This sectien of the publication contains only Appendixes E and C contain
other contrel areas used by RSCS. Section 3. RSCS tata Areas and Contrel Blocks 247

ASYNE ASYNE defines symbolic addresses for
asynchronous exit queue element contains
handle asynchroncus interrupts. elements on an asynchronous exit queue. An information ty which a task requests that it IOEXITQ, EXTQ, and ALERTQ in SVECTORS are the heads cf three asynchroncus exit queues.
Each of these queues is comprised of supervisor elements defined by the ASYNE DSECT. IOEXITQ points to requests fer I/O exits, EXTC points to requests for external exit
requests, and ALERTQ points to requests for ALER7 exits.
, 0 ASYNNEXT I I 4 ASYlfTASK I , 8 ASYNEXIT I , C ASYlfCODE I//ASYNSPAR///I ASYlfID I Hexadecimal Field
Displacement lfa.e Field Description, Contents, I!eaning ------------ -------------------------------------- 0 ASYlflfEXT DS 1F Address of the next asynchronous
interrupt exit request element
4 ASYlfTASK DS 1F Address of task elellent describing
the task that requested the
asynchron-ous interrupt 8 ASYNEXIT DS 1F Address of the requested asynchrcnous exit
routine
C ASYNCODE DS AL2 Address of the device for which
asynchronous I/O interrupts are
requested or interrupt bit code
E ASYNSPAR DS 1X Reserved for IBM use
F ASYlfID DS 1X 1-byte identification of the task owning the
asynchronous exit routine
248 IBM VM/370 Data Areas and Control Block Logic